我发现有关此主题(CMPedometer)的资源非常有限。我想知道这里是否有人设法让它正常工作。我的代码相当简单,而且比我想做的要多。基本上,步数计数器不会增加用户采取的每一步。
它实际上在跟踪用户的每一步,但更新速度如此之慢,我不明白为什么。我什至尝试使用 NSTimer 请求每半秒更新一次标签。我想尝试让计步器在用户迈出一步时更新。这是我的代码...
#import "ViewController.h"
#import <CoreMotion/CoreMotion.h>
@interface ViewController ()
@property (nonatomic, strong) CMPedometer *pedometer;
@property (nonatomic, weak) IBOutlet UILabel *startDateLabel;
@property (nonatomic, weak) IBOutlet UILabel *endDateLabel;
@property (nonatomic, weak) IBOutlet UILabel *stepsLabel;
@property (nonatomic, weak) IBOutlet UILabel *distanceLabel;
@property (nonatomic, weak) IBOutlet UILabel *ascendedLabel;
@property (nonatomic, weak) IBOutlet UILabel *descendedLabel;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
if ([CMPedometer isStepCountingAvailable]) {
self.pedometer = [[CMPedometer alloc] init];
[NSTimer scheduledTimerWithTimeInterval:0.5f
target:self
selector:@selector(recursiveQuery)
userInfo:nil
repeats:YES];
} else {
NSLog(@"Nothing available");
self.startDateLabel.text = @"";
self.endDateLabel.text = @"";
self.stepsLabel.text = @"";
self.distanceLabel.text = @"";
self.ascendedLabel.text = @"";
self.descendedLabel.text = @"";
}
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.pedometer startPedometerUpdatesFromDate:[NSDate date]
withHandler:^(CMPedometerData *pedometerData, NSError *error) {
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"data:%@, error:%@", pedometerData, error);
});
}];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.pedometer stopPedometerUpdates];
}
- (NSString *)stringWithObject:(id)obj {
return [NSString stringWithFormat:@"%@", obj];
}
- (NSString *)stringForDate:(NSDate *)date {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateStyle = NSDateFormatterShortStyle;
formatter.timeStyle = NSDateFormatterShortStyle;
return [formatter stringFromDate:date];
}
- (void)queryDataFrom:(NSDate *)startDate toDate:(NSDate *)endDate {
[self.pedometer queryPedometerDataFromDate:startDate
toDate:endDate
withHandler:
^(CMPedometerData *pedometerData, NSError *error) {
NSLog(@"data:%@, error:%@", pedometerData, error);
dispatch_async(dispatch_get_main_queue(), ^{
if (error) {
NSLog(@"Error = %@",error.userInfo);
self.startDateLabel.text = @"";
self.endDateLabel.text = @"";
self.stepsLabel.text = @"";
self.distanceLabel.text = @"";
self.ascendedLabel.text = @"";
self.descendedLabel.text = @"";
} else {
self.startDateLabel.text = [self stringForDate:pedometerData.startDate];
self.endDateLabel.text = [self stringForDate:pedometerData.endDate];
self.stepsLabel.text = [self stringWithObject:pedometerData.numberOfSteps];
self.distanceLabel.text = [NSString stringWithFormat:@"%.1f[m]", [pedometerData.distance floatValue]];
self.ascendedLabel.text = [self stringWithObject:pedometerData.floorsAscended];
self.descendedLabel.text = [self stringWithObject:pedometerData.floorsDescended];
}
});
}];
}
- (void)recursiveQuery {
NSDate *to = [NSDate date];
NSDate *from = [to dateByAddingTimeInterval:-(24. * 3600.)];
[self queryDataFrom:from toDate:to];
}
提前感谢您的任何反馈!
编辑
似乎用于实时更新的适当方法如下..
- (void)liveSteps {
[self.pedometer startPedometerUpdatesFromDate:[NSDate date]
withHandler:^(CMPedometerData *pedometerData, NSError *error) {
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Steps %@",pedometerData.numberOfSteps);
});
}];
}
然而,即使这样也被严重延迟了。有谁知道如何正确使用它来在用户采取步骤时进行实质性更新?
最佳答案
我只能确认您的发现。我还想获得“真实”的实时信息。在这一点上,API 似乎无法做到这一点;甚至通过强制将更新放入队列、同步、异步等。
对于引用和其他有这个问题的人,这里是我使用的基于 Swift 3 和 Xcode 8.2 的代码。在检查 CMPedometer.isStepCountingAvailable() 之后,我只是将这部分代码应用到相关的 View Controller 中。
如您所见,我添加了一个小动画以更流畅的方式更新 UILabel。
// Steps update in near realtime - UILabel
self.pedoMeter.startUpdates(from: midnightOfToday) { (data: CMPedometerData?, error) -> Void in
DispatchQueue.main.async(execute: { () -> Void in
if(error == nil){
self.todaySteps.text = "\(data!.numberOfSteps)"
// Animate the changes of numbers in the UILabel
UILabel.transition(with: self.todaySteps,
duration: 0.50,
options: .transitionCrossDissolve,
animations: nil,
completion: nil)
}
})
}
关于ios - 使用 CMPedometer (CoreMotion) 进行实时更新,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36439912/